java is one of the computer language.

I m a Mechanical Guy- want to develop optimization technologies using Artificial Neural networks and Genetic Algorithms- For which I prefer Java(Not knowing the technical contents of Java But simply coz of the craze ). Can I learn Java with a short span. I m New to the field of programming and know some basics in C

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How is this done using java nested loops?
Please show me step by step on how that is done- I really have no idea on how to do this...Thank you.

(This is in java language.)

Thanks
please also explain on the steps too..Thanks

1. Java
2. Dot net
3. PHP
4. Python

I m interested in purchasing a MacBook Air. Basically I would use it for the basic computer functions- as well as a computer to write software code. Is it possible to write programs for windows on a mac? I would use either C++- Java or Visual Basic. Thanks!
So if I can write windows programs on Mac- lets say Java or CSS- what s a place to get started? I suppose I ll have to learn how to make it work on both OSs. Where can I get started?